A.
case(depth<=70 "Shallow" depth>70 AND depth<=300 "Mid" depth>300 "Deep")
B.
case(depth<=70, "Shallow" , depth>70 AND depth<=300, "Mid" , depth>300, "Deep")
C.
case(depth<=70, "Shallow" , depth>70 && depth<=300, "Mid" , depth>300, "Deep")
D.
case(depth<=70, "Shallow" , depth>70 && depth<=300, "Mid" , depth>300, "Deep")